TITLE

Glass transition of poly(ethylmethacrylate) admixed and bound to nanoparticles

AUTHOR(S)
Friedrichs, Cornelius; Emmerling, Sebastian; Kircher, Gunnar; Graf, Robert; Wolfgang Spiess, Hans
PUB. DATE
March 2013
SOURCE
Journal of Chemical Physics;Mar2013, Vol. 138 Issue 12, p12A503
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The chain dynamics at the glass transition of poly(ethylmethacrylate) in the bulk is compared to that of mixtures of the polymer with nanoparticles by advanced NMR methods. In order to make the two components compatible, the particles were functionalized with the polymer itself. Particular emphasis is placed on the extended local chain conformations of this polymer accessible by 13C NMR spectroscopy. The isotropization dynamics of these extended conformations is only slightly changed in the mixtures, but is significantly slowed down by attachment of the chains to the nanoparticles themselves. The slowing down is studied at various distances from the nanoparticle and is observed for most of the attached chains segments except for the chain ends. The results are put into perspective to the glass transition in polymers attached to surfaces, thin polymer layers, and the chain dynamics of star polymers.
ACCESSION #
86446787

 

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